### A p r il 23

, 2003

T o: A r t hu r C a r bone ll

M e c han i c a l E ng i nee r i ng S e c t i on

F r o m: R a l ph D e S i ena

M on i t o r i ng and T e c hn i c a l S e r v i c e s S e c t i on

S u b j ec t: Ot a y M e s a G ene r a t i ng C o

., LL C

A pp li c a t i on N o

. 978379

A n A i r Q ua li t y I m pa c t A na l ys i s ( A Q I A ) w a s pe r f o rm ed f o r t he Ot a y M e s a G ene r a t i ng P r o j e c t 510

M W na t u r a l ga s

- f i r ed

, c o m b i ned cyc l e e l e c t r i c gene r a t i ng p r o j e c t b y S i e rr a R e s ea r c h f o r Ot a y

M e s a G ene r a t i ng C o m pan y

, LL C i n s uppo r t o f r eque s t ed m od i f i c a t i on s t o t he F i na l D e t e rm i na t i on

o f C o m p li an c e ( F D O C )

. T he F D O C w a s p r e v i ou s l y r e v i s ed i n A p r il 2002 ( A m end m en t 1 A ) and

i n c l uded a r e v i s ed s i t e l a y ou t, i n c r ea s ed s t a ck he i gh t s

, r edu c ed P M 10 e m i ss i on s

, and t he add i t i on

o f t w o w e t s u r f a c e a i r c oo l e r s

. A dd i t i ona l de s i gn c hange s t ha t a ff e c t t he a i r qua li t y i m pa c t

a ss e ss m en t w e r e i n c l uded i n a ne w s ub m i tt a l da t ed J u l y 2002 ( A m end m en t 1 B )

. D e s i gn c hange s

t ha t w e r e i n c l uded a r e :

• T he f a c ili t y l a y ou t w a s m od i f i ed

, r e s u l t i ng i n c hange s i n s t a ck and s t r u c t u r e l o c a t i on s

.

• T he s t a cks f o r t he t w o t u r b i ne s a r e no w s epa r a t ed and r a i s ed i n he i gh t an add i t i ona l 16 f ee t t o

t he ne w s t a ck he i gh t o f 160 f ee t.

• 388

. 1 MM B t u / h r ( HH V ) du c t bu r ne r s will be added t o ea c h HR S G.

• T he add i t i on o f an au x ili a r y bo il e r

.

T he f a c ili t y po t en t i a l t o e m i t e m i ss i on s pe r t h i s a m end m en t, a s c o m pa r ed t o t he o r i g i na l p r o j e c t,

a r e a s f o ll o w s :

P O LL U T A NT O R I G I N AL A M E N D M E NT C H A N GE

Ni t r ogen o x i de s 100 T P Y 100 T P Y 0 T P Y

C a r bon m ono x i de 281

. 8 T P Y 316 T P Y + 34 T P Y

S u l f u r d i o x i de 39

. 4 T P Y 12

. 8 T P Y

- 26

. 6 T P Y

P a r t i c u l a t e m a tt e r 159

. 6 T P Y 99

. 5 T P Y

- 60

. 1 T P Y

V o l a t il e o r gan i c c o m pound s 29

. 2 T P Y 47

. 5 T P Y + 18 T P Y

T he f a c ili t y i s a m a j o r s t a t i ona r y s ou r c e and PS D s ou r c e f o r P a r t i c u l a t e M a tt e r ( P M 10 )

, Ni t r ogen

o x i de s ( NO

x )

, and C a r bon M ono x i de ( C O )

.Di s pe r s i on m ode li ng w a s c ondu c t ed f o r ongo i ng ope r a t i ona l e m i ss i on s o f NO 2 , C O, SO 2, and

P M 10

. T he app li c an t and t he i r c on s u l t an t ( S i e rr a R e s ea r c h ) w o r k ed c l o s e l y wi t h t he Di s t r i c t i n

de v e l op i ng m ode li ng and ana l ys i s p r o c edu r e s i n s uppo r t o f de m on s t r a t i ng c o m p li an c e wi t h a ll

app li c ab l e r equ i r e m en t s

. V a r i ou s m ode li ng t e c hn i que s w e r e e m p l o y ed i n c l ud i ng I S C S T 3

, I S C

_ O L M

, and AE R M O D

. T ab l e 1 s u mm a r i z e s t he m ode l and m e t eo r o l og i c a l da t a e m p l o y ed f o r

i m pa c t ana l ys i s o f t he v a r i ou s po ll u t an t s and a v e r ag i ng t i m e s

.

T A B L E 1

A I R Q U A L I T Y M O D E L

A N D M E T E O R O L OG I C A L D A T A

U SE D F O R A Q I A

P O LL U T A NT A

VE R A G E PE R I OD M O D EL M E T D A TA

NO 2 1 H our I S C

_ O LM M I R A M A R 92

- 94

NO 2 A nnual I S C S T3 M I R A M A R 92

- 94

CO A ll I S C S T3 M I R A M A R 92

- 94

P M 10 24 H our AE R M OD O T A Y 94

- 96

P M 10 A nnual I S C S T3 M I R A M A R 92

- 94

T o en s u r e t he i m pa c t s ana l yz ed w e r e f o r m a x i m u m e m i ss i on l e v e l s and w o r s t

- c a s e d i s pe r s i on

c ond i t i on s

, a sc r een i ng p r o c edu r e w a s u s ed t o de t e rm i ne t he i npu t s f o r t he m a x i m u m i m pa c t

m ode li ng

. T he sc r een i ng ana l ys i s s ho w ed t ha t i m pa c t s w e r e m a x i m i z ed f o r ea c h po ll u t an t w hen

t he t u r b i ne s ope r a t ed a t 100 % l oad wi t h du c t f i r i ng a t l o w a m b i en t t e m pe r a t u r e c ond i t i on s

. T he

t u r b i ne e m i ss i on s and s t a ck pa r a m e t e r s du r i ng t he s e ope r a t i ng c ond i t i on s a r e s u mm a r i z ed i n

T ab l e 2

.

T A B L E 2

T U RB I N E E M I SS I O N S A N D S T A CK P A R A M E T E R S

P R O D U C I N G W O R S T C A SE I M P A C T S

D U R I N G N O R M A L O PE R A T I N G C O N D I T I O N S

S t ack D i a m e t er ( F ee t ) S t ack H e i ght

( F ee t ) E x h a u s t T e mp

( deg K ) E x h a u s t V e l o c i ty

(m / s ) N O x

l b / h r SO 2 l b / hr C O

l b / h r P M 10

l b / h r

18 .5 160 354 .1 19

. 26 15

. 95 1

. 55 29 .1 11 .5

D u r i ng ongo i ng ope r a t i on s

, t u r b i ne s hu t do w n and s t a r t up s will o cc u r

. F a c ili t y i m pa c t s w e r e

e v a l ua t ed wi t h one t u r b i ne i n s t a r t up ope r a t i ng a t t he e m i ss i on and s t a ck pa r a m e t e r s ( 60 % l oad ) i n

T ab l e 3 and one t u r b i ne a t pea k l oad a s de f i ned i n T ab l e 2

.

T A B L E 3

T U RB I N E E M I SS I O N S A N D S T A CK P A R A M E T E R S

D U R I N G S T A R T U P C O N D I T I O N S

S t ack D i a m e t er ( F ee t ) S t ack H e i ght

( F ee t ) E x h a u s t T e mp

( deg K ) E x h a u s t V e l o c i ty

(m / s ) N O x

l b / h r SO 2 l b / hr C O

l b / h r P M 10

l b / h r

18 .5 160 347 .0 12

. 78 239 .9 0 .9 2706 7 .5A n au x ili a r y bo il e r w a s added t o t he f a c ili t y i n t h i s a m end m en t. T he au x ili a r y bo il e r m a y be

ope r a t ed w h il e 1 t u r b i ne i s ope r a t i ng i n pea k m ode

, w h il e t he o t he r t u r b i ne i s i n s t a r t up m ode

. T he

au x ili a r y bo il e r e m i ss i on s and s t a ck pa r a m e t e r s du r i ng t he s e ongo i ng ope r a t i ng c ond i t i on s a r e

s u mm a r i z ed i n T ab l e 4

.

T A B L E 4

A U X I L I A R Y B O I L E R E M I SS I O N S A N D S T A CK P A R A M E T E R S

D U R I N G A T U RB I N E S T A R T U P

S t ack D i a m e t er ( F ee t ) S t ack H e i ght

( F ee t ) E x h a u s t T e mp

( deg K ) E x h a u s t V e l o c i ty

(m / s ) N O x

l b / h r SO 2 l b / hr C O

l b / h r P M 10

l b / h r

2 .5 85 435 .9 27 .0 0

. 96 0

. 06 3

. 26 1

. 65

T he m a x i m u m f a c ili t y i m pa c t s w e r e de t e rm i ned b y e v a l ua t i ng i m pa c t s w h il e bo t h t u r b i ne s w e r e

ope r a t i ng unde r v a r i ou s l oad and a m b i en t c ond i t i on s wi t h and wi t hou t du c t bu r ne r s f i r i ng

. A dd i t i ona ll y

, f a c ili t y m ode li ng w a s pe r f o rm ed wi t h 1 t u r b i ne a t pea k l oad

, 1 t u r b i ne i n s t a r t up m ode

, and t he au x ili a r y bo il e r ope r a t i ng

. M a x i m u m p r ed i c t ed s ho r t

- t e rm i m pa c t s f o r NO 2 and C O a r e

s een wi t h 1 t u r b i ne i n s t a r t up m ode s i n c e t he s e e m i ss i on s a r e e l e v a t ed

. SO 2 and P M 10 e m i ss i on s

a r e no t e l e v a t ed du r i ng t u r b i ne s t a r t up s and

, t he r e f o r e

, m a x i m u m i m pa c t s f o r t he s e po ll u t an t s a r e

s een w h il e bo t h t u r b i ne s a r e ope r a t i ng a t pea k l oad c ond i t i on s

. T he m a x i m u m p r ed i c t ed f a c ili t y

i m pa c t f o r an y o f t he v a r i ou s on

- go i ng ope r a t i on sc ena r i o s m ode l ed i s p r e s en t ed i n T ab l e 5

. W o r s t c a s e ba ck g r ound po ll u t an t c on c en t r a t i on s w e r e added t o t he p r ed i c t ed m a x i m u m po ll u t an t

i m pa c t s and c o m pa r ed t o F ede r a l and C a li f o r n i a A m b i en t A i r Q ua li t y S t anda r d s.

T A B L E 5

M O D E L E D M A

X I M U M I M P A C T S

F O R O N GO I N G F A C I L I T Y O PE R A T I O N

P o ll u t a n t A

v e r a g i ng

P e r i od M ax i m u m

M od e l e d

I m p act 6

( m g /m 3 ) B ack g r ound 1

( m g /m 3 ) T o t a l P r e d i c t e d

C on ce n t r a t i on

( m g /m 3 ) C AA Q S

( m g /m 3 ) N AA Q S

( m g /m 3 )

NO 2 1

- H our 201 5 205 406 470

------

NO 2 A nnual 0

. 65 2 37 .6 38

. 25

------ 100

SO 2 1

- H our 9 .1 392 .6 401 .7 655

-----

SO 2 3

- H our 7 .7 183 .2 190 .9

----- 1300

SO 2 24

- H our 1 .5 62 .8 64 .3 105 365

SO 2 A nnual 0. 08 10 .5 10

. 58

----- 80

C O 1

- H our 9025 8245 17270 23

, 000 40

, 000

CO 8

- H our 1797 4398 6195 10

, 000 10

, 000

P M 10 24

- H our 4 .8 4 103 107 .8 50 3 150

P M 10 A nnual 8 0

. 98 32 33

----- 50

P M 10 A nnual 7 0

. 98 29 30 30 3

-----

1 M a x i m u m c on c e n t r a t i on ob s e r v e d a t t h e C hu l a V i s t a M on i t o r i ng s t a t i on ( 1993

- 1997 )

. 2 T h e p r e d i c t e d annua l NO

x i n c r e a s e i s 0

. 87 μ g /m 3

. U s i ng t h e A R M d e f au l t v a l u e o f 0

. 75 , t h i s i s r e du c e d t o 0

. 65

μ g /m 3

. 3 T h e p r o j e c t a r e a i s d e s i gna t e d a s non

- a tt a i n m e n t f o r t h e s t a t e PM 10 s t anda r d s

. 4 V a l u e f r o m AE R M O D

. 5 V a l u e f r o m I S C

_ O L M

. 6 V a l u e s f r o m I S C S T 3 m od e li ng un l e ss no t e d o t h e r w i s e

. 7 G e o m e t r i c m e an

8 A r i t h m e t i c m e anT he r e s u l t s o f t he m ode li ng i nd i c a t e t ha t ongo i ng f a c ili t y ope r a t i on will no t r e s u l t i n e xc eedan c e s o f

F ede r a l and C a li f o r n i a s t anda r d s wi t h t he e xc ep t i on o f t he C a li f o r n i a 24

- H ou r s t anda r d f o r P M 10

, f o r w h i c h t he p r o j e c t a r ea i s de s i gna t ed non

- a tt a i n m en t. S i n c e ba ck g r ound P M 10 v a l ue s e xc eed

t h i s s t anda r d i n t he p r o j e c t v i c i n i t y

, m ode li ng w a s pe r f o rm ed t o de t e rm i ne w he t he r ope r a t i on o f t he

f a c ili t y w ou l d r e s u l t i n add i t i ona l v i o l a t i on s o f t he C a li f o r n i a 24 H ou r P M 10 s t anda r d

.

S i n c e t he m a x i m u m p r ed i c t ed i m pa c t f o r t he f a c ili t y w a s 4

. 8 μ g /m 3

, AE R M O D m ode li ng w a s

pe r f o rm ed f o r a ll da ys i n t he 1994

- 1996 pe r i od t ha t P M 10 ba ck g r ound c on c en t r a t i on s w e r e g r ea t e r

t han 45 μ g /m 3 bu t l e ss t han o r equa l t o 50 μ g /m 3 ( C a li f o r n i a S t anda r d )

. T he r e s u l t s a r e p r e s en t ed

i n T ab l e 6

. T he r e s u l t s de m on s t r a t e t ha t ongo i ng f a c ili t y ope r a t i on s w ou l d no t c au s e add i t i ona l

v i o l a t i on s o f t he C a li f o r n i a 24

- hou r A m b i en t A i r Q ua li t y S t anda r d f o r P M 10

.

T A B L E 6

M O D E L I N G R ES U L T S F O R D A Y S

W I T H C HU L A V I S T A 24

- H O U R P M 10 C O N C E N T R A T I O N S

G R E A T E R T H A N 45 μ g /m 3 B U T L ESS T H A N T H E C AA Q S

D a t e o f H i gh B ack g r ound C hu l a V i s t a

B ack g r ound ( m

g /m 3 ) H i gh e s t D a il y

P r e d i c t i on

( m g /m 3 ) T o t a l P M 10

( m g /m 3 )

A ugu s t 31

, 1995 ( da y 243 ) 46 1

. 8 47

. 8

N o v e m be r 5

, 1995 ( da y 309) 46 2

. 5 48

. 5

N o v e m be r 30

, 1995 ( da y 334) 46 1

. 0 47

. 0

O c t obe r 6

, 1996 ( da y 280 ) 48 1

. 2 49

. 2

O c t obe r 18

, 1996 ( da y 292 ) 46 2

. 0 48

. 9

D u r i ng t he i n i t i a l c o mm i ss i on i ng pe r i od

, C O and NO

x e m i ss i on s a r e e x pe c t ed t o be m u c h h i ghe r

s i n c e t he c on t r o l sys t e m will no t y e t be op t i m i z ed

. 1

- H ou r C O, 8

- H ou r C O, and 1

- H ou r NO

x

e m i ss i on s w e r e m ode l ed t o de t e rm i ne w he t he r t he F ede r a l and C a li f o r n i a A m b i en t A i r Q ua li t y

S t anda r d s f o r C O and NO 2 w ou l d be v i o l a t ed du r i ng c o mm i ss i on i ng

. SO 2 and P M 10 e m i ss i on s

a r e no t e l e v a t ed du r i ng t h i s pe r i od and , t he r e f o r e

, w e r e no t e v a l ua t ed

.

S i n c e e m i ss i on s will v a r y du r i ng t h i s pe r i od dependen t upon c on t r o l equ i p m en t s t a t u s

, and

w he t he r one o r bo t h t u r b i ne s a r e ope r a t i ng

, an a ss u m p t i on w a s m ade t o a ss u m e t ha t t he t o t a l

e m i ss i on s w e r e r e l ea s ed f r o m a s i ng l e s t a ck f o r t h i s m ode li ng

. I t w a s a l s o a ss u m ed t ha t t he

au x ili a r y bo il e r w ou l d no t be ope r a t i ng a t t h i s t i m e

. T he t u r b i ne e m i ss i on s and s t a ck pa r a m e t e r s

du r i ng t he c o mm i ss i on i ng pe r i od ope r a t i on a r e s u mm a r i z ed i n T ab l e 7

.

T A B L E 7

T U RB I N E E M I SS I O N S A N D S T A CK P A R A M E T E R S

D U R I N G C O MM I SS I O N I N G

S t ack D i a m e t er ( F ee t ) S t ack H e i ght

( F ee t ) E x h a u s t T e mp

( deg K ) E x h a u s t V e l o c i ty

(m / s ) N O x

l b / h r SO 2 l b / hr C O

l b / h r P M 10

l b / h r

18 .5 160 365 .3 13

. 53 1133 N/ A 270635 N /AT he m a x i m u m p r ed i c t ed f a c ili t y i m pa c t s m ode l ed f o r t he c o mm i ss i on i ng pe r i od a r e p r e s en t ed i n

T ab l e 8 be l o w

. W o r s t c a s e ba ck g r ound po ll u t an t c on c en t r a t i on s w e r e added t o t he p r ed i c t ed

m a x i m u m po ll u t an t i m pa c t s and c o m pa r ed t o F ede r a l and C a li f o r n i a A m b i en t A i r Q ua li t y

S t anda r d s

. T he I S C

_ O L M m ode l w a s u s ed t o de t e rm i ne NO 2 m a x i m u m 1

- H ou r p r ed i c t ed

c on c en t r a t i on s

. T he I S C S T 3 m ode l w a s u s ed t o de t e rm i ne t he p r ed i c t ed 1

- H ou r and 8

- H ou r C O

i m pa c t s

.

T A B L E 8

M O D E L E D M A

X I M U M I M P A C T S

F O R C O MM I SS I O N I N G PE R I O D F A C I L I T Y O PE R A T I O N

P o ll u t a n t A

v e r a g i ng

P e r i od M ax i m u m

M od e l e d

I m p act 3

( m g /m 3 ) B ack g r ound

( m g /m 3 ) T o t a l P r e d i c t e d

C on ce n t r a t i on

( m g /m 3 ) C AA Q S

( m g /m 3 ) N AA Q S

( m g /m 3 )

NO 2 1

- H our 405 2 21 1 426 470

------

C O 1

- H our 8035 8245 16280 23

, 000 40

, 00 0

CO 8

- H our 3882 4398 8280 10

, 000 10

, 000

1 NO 2 c on c e n t r a t i on ob s e r v e d a t t h e C hu l a V i s t a M on i t o r i ng s t a t i on f o r m a x i m pa c t hou r ( 993040104 )

. 2 V a l u e f r o m I S C

_ O L M

. 3 V a l u e s f r o m I S C S T 3 m od e li ng un l e ss no t e d o t h e r w i s e

.

T he r e s u l t s de m on s t r a t e t ha t f a c ili t y ope r a t i on s du r i ng t he c o mm i ss i on i ng pe r i od will no t c au s e

v i o l a t i on s o f C a li f o r n i a o r F ede r a l A m b i en t A i r Q ua li t y S t anda r d f o r C O o r NO 2

.

I n c on c l u s i on

, t he A i r Q ua li t y I m pa c t A na l ys i s r e s u l t s de m on s t r a t e t ha t f a c ili t y ope r a t i on s du r i ng

t he c o mm i ss i on i ng pe r i od and no rm a l ongo i ng ope r a t i on s will no t c au s e v i o l a t i on s o f e i t he r t he

C a li f o r n i a o r F ede r a l A m b i en t A i r Q ua li t y S t anda r d s f o r C O, NO 2

, SO 2

, and P M 10

.

R a l ph D e S i ena

A i r P o ll u t i on M e t eo r o l og i s t

S an Di ego A i r P o ll u t i on C on t r o l Di s t r i c t